Scale dependence of twist-3 quark–gluon operators for single spin asymmetries

We derive the scale dependence of twist-3 quark–gluon operators, or ETQS matrix elements, at one-loop. These operators are used to factorize transverse single spin asymmetries, which are studied intensively both in experiment and theory. The scale dependence of two special cases are particularly int...

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Bibliographic Details
Published in:	Physics letters. B Vol. 715; no. 1-3; pp. 157 - 163
Main Authors:	Ma, J.P., Wang, Q.
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier B.V 29-08-2012 Elsevier
Subjects:	Asymmetry Elementary particles Evolution Exact sciences and technology Nuclear physics Operators Particle spin Physics The physics of elementary particles and fields Operator Quarks Asymmetry Gluons Matrix elements
Online Access:	Get full text
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Summary:	We derive the scale dependence of twist-3 quark–gluon operators, or ETQS matrix elements, at one-loop. These operators are used to factorize transverse single spin asymmetries, which are studied intensively both in experiment and theory. The scale dependence of two special cases are particularly interesting. One is of soft-gluon-pole matrix elements, another is of soft-quark-pole matrix elements. From our results the evolutions in the two cases can be obtained. A comparison with existing results of soft-gluon-pole matrix elements is made.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0370-2693 1873-2445
DOI:	10.1016/j.physletb.2012.07.036